What is the reason of "FAN 3A FAILED"?


Fan Status is down,what is the reason?

Best Answer

  • escgateescgate Member
    Accepted Answer


    My customer's device (TH940 / 4.1.4-GR1-P1) has the same issue.

    Apr 15 2019 01:55:56 Info    [SYSTEM]:Fan 3A is OK. Current value is 5640

    Apr 15 2019 01:43:58 Critical  [SYSTEM]:Fan 3A failed. Current value is 22080.

    TAC confirmed a HW RMA process at the time.

    But, personally I cannot completely rule out the possibility of SW bug on monitoring the fans because I experienced the bug of monitoring the fans on 2.7.1-GR1 & TH930 for 3 years. That was a bug at the time and We are a problem on the same fan!.

    I think it worth opening a case to investigate this.



  • huzhiqihuzhiqi Member

    I think u re right.

  • escgateescgate Member


    I was worried it might be a bug.

    Please share the result from your case in here community.

  • huzhiqihuzhiqi Member

    Techsupport tell me it is a bug,it happens in model TH940/TH1040 with version 4.1.4-GR1-P2 or produce before 2019-08-01,we need to upgrade the version of Embedded Controller to ec1.26 or later,it maybe fix this issue.

  • escgateescgate Member

    Could you share the bug ID?

    Thank you.

  • escgateescgate Member

    I got the bug ID 484471.,


  • huzhiqihuzhiqi Member

    How to query the bug id?

  • escgateescgate Member

    I checked it in the 4.1.4-GR1-P3 RN.

  • huzhiqihuzhiqi Member

    Can u share the  4.1.4-GR1-P3 RN to me?

    My e-mail is [email protected]

  • escgateescgate Member
    edited May 2020

    I think you are a A10 partner.

    If you are a A10 partner, you can get it from https://documentation.a10networks.com/index.html.

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